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Alfa Laval
Viscoline Annular Unit

Viscoline Annular Unit

Product catalog summary

Applications
The ViscoLine™ Annular unit is a tube-in-tube-in-tube heat exchanger designed for heating, cooling, and pasteurizing high-viscosity products and those containing particulates. It is suitable for aseptic applications with steam purge and leak detectors, commonly used with low-acid, high-viscosity products like tomato concentrate, banana paste, and chocolate sauce.

Standard Design
The unit consists of three or four concentric tubes, with the product medium flowing between two service channels, allowing simultaneous heating or cooling from inside and outside. It supports easy inspection and features counter-current flow. The unit is modular, with components connected in series on a common frame. Spare parts are limited to O-rings in the header.

Materials
Product side tubes are made of stainless steel AISI 316L or SMO254, while the service side shell uses stainless steel AISI 304 or AISI 316. The frame is stainless steel AISI 304, with optional angling for self-draining.

Technical Data
The unit is designed for a mechanical pressure of 25 bar on the product side and 10 bar on the service side, with a temperature capacity of 140°C. It complies with the European Pressure Equipment Directive (PED) and can bear the CE mark. Expansion joints are included to manage thermal expansion.

Connections
Various connection types are available, including SMS union parts, ISO union parts, clamp union parts, flange connections, and tri-clamps for the product side, and DIN 2576 flanges, ANSI flanges, and clamp union parts for the service side.

Options
Additional features include protection sheets and thermal insulation.

Designation
Units are designated by a code indicating the number of product tubes, tube diameters, module length, and material specifications. For example, VLA1x76/104/129/154-6.0-316L/304-H indicates a unit with specific tube diameters and materials.

Specifications
Detailed specifications include tube and shell diameters, module lengths, volume, and heat transfer area for various models, such as VLA1x38/51/76-3.0 and VLA1x89/114/129/154-6.0.

Contact Information
For more details, contact Alfa Laval through their website at www.alfalaval.com.

Catalog excerpts

ViscoLine™ Annular Unit The tubular heat exchanger series from Alfa Laval Applications The ViscoLineTM Annular unit is a tube-in-tube-in-tube heat exchanger that is ideal for the heating, cooling and pasteurization of products with high viscosity, and products that contain particulates. The unit is highly suitable for aseptic applications with steam purge and leak detectors. These units are most commonly used in conjunction with lowacid products with average/high viscosity, such as tomato concentrate, banana paste, sourdough, chocolate sauce, mayonnaise, malt extract and tomato-based sauces in general. Standard design The ViscoLine Annular unit consists of three or four concentric tubes. In the case of four tubes (with low service velocity), the innermost tube is empty. The product medium flows in between two service channels, and is heated or cooled from the inside and outside at the same time. The unit features easy, full inspection of the product side. The product medium inside the tube runs in a flow that is counter-current in relation to the service medium. If required, the product tube can feature a hard corrugated surface. ViscoLine Annular modules are normally connected in series and grouped on a common frame. The only spare parts needed are the O-rings in the header. The ViscoLine Annular unit is provided with double 180° elbow joints that enable continuous heat treatment. There is a maximum gap on the product side of 18 mm and a minimum gap of 5 mm. Standard materials Other materials are available on request. Product side (tubes) Stainless steel AISI 316L or SMO254 Service side (shell) Stainless steel AISI 304 or AISI 316 Frame Stainless steel AISI 304 (units can be angled for self-draining on request) ViscoLine Annular with open sectional view Graphic representation of the flow pattern in the ViscoLine Annular Unit.

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Technical data Mechanical design pressure The ViscoLine Annular unit was designed for a pressure of 25 bar (363 PSI) on the product side (tubes) and 10 bar (145 PSI) on the service side (shell), depending on the connection. The unit can, however, accommodate higher pressure ratings, depending on component thickness and connection type. The ViscoLine Annular Unit complies with the European Pressure Equipment Directive (PED), and is entitled to bear the CE mark, though depending on the design of the connections. It is designed for a temperature of 140°C (284°F). All units are provided with an expansion...

Open the catalog to page 2

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